CN1291420A - Ballast circuit - Google Patents
Ballast circuit Download PDFInfo
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- CN1291420A CN1291420A CN99803197A CN99803197A CN1291420A CN 1291420 A CN1291420 A CN 1291420A CN 99803197 A CN99803197 A CN 99803197A CN 99803197 A CN99803197 A CN 99803197A CN 1291420 A CN1291420 A CN 1291420A
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- 239000004065 semiconductor Substances 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 12
- 230000005669 field effect Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical class [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000007537 lampworking Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
- H05B41/2827—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Lamp voltage or current obtained from a self-oscillating converter is stabilized by a feedback circuit. Gates of the switching transistors are connected to output windings of a current transformer whose input current winding is in series with the resonant load lamp circuit. The lamp voltage or current is sensed, and the resulting signal is used to control current through an auxiliary control winding on the current transformer. Preferably, two opposite conductivity type control transistors are connected in parallel across the control winding, and low-pass filtered DC signals corresponding to the lamp voltage or current bias the control transistors.
Description
The present invention relates to be used to operate the electric ballast of the discharge lamp such as the fluorescence electric light, be particularly related to the such ballast that is used in the following application, in this uses, no matter be that the variation of lamp working parameter all is undesirable owing to ambient temperature, line voltage distribution or other variation.
In the market of height competition, mass-produced most of magnetic coupling self-oscillation converters are used for selling.Usually, the half-bridge converter is owing to having reduced number of parts, so have lower cost.Such converter can be divided into two groups: utilize the converter of the current transformer with saturated core, common and power BJT=s (bipolarity junction transistor) combines; Have the converter of linear unshakable in one's determination current transformer with utilization, usually and MOSFET (mos field effect transistor) combine.Such just as one of ordinary skill understood, at this, linear iron core is such iron core, and operation therein is to carry out on the zone of B-H characteristic with curve rather than sharp-pointed B-H characteristic; That is, whenever such flux level causes a significant increase in flux level will be accompanied by significant increase in the magnetizing current.
Have in the lamp ballast of saturated core in design, power BJT occupies most of switch periods memory time, and it is the complicated function of the minority carrier lifetime time in current gain, collector current and the base stage in forward direction base current, negative base current, the saturation mode.This a large amount of variable and influence factor and make circuit very sensitive for its operational environment, and this circuit working point changes, changes or the like according to ambient temperature along with the variation of load and input power line voltage distribution.
Article " the AA Mathematical Modeling that is used for the D quasi-converter of small-sized fluorescent lamp ballast " (the IEEE journal of power electronics at L.R.Nerone, vol.10, no.6, November nineteen ninety-five the 708-715 page or leaf) in can find the mathematical analysis of the fluorescent lamp transducer of half-bridge MOSFET type.This civilian Fig. 3 has represented to have the schematic diagram of so a kind of converter of the current transformer of connecting with resonant load circuit.This current transformer has primary coil or load current coil T
1c, it detects converter output current and direct output winding T from current transformer
1aAnd T
1bControl signal is provided to the control utmost point of MOSFET.Fluorescent lamp is in parallel with tuning capacitor C, and this combination is connected with resonant inductance L then.This circuit has a shortcoming, is exactly that this circuit is quite responsive to the direct voltage that is provided to half-bridge circuit.Footnote 1 on 710 pages points out that the variation of this circuit can be used to reduce the sensitivity that power line changes sometimes, detects condenser current itself in this circuit.Further, point out as 712 pages, for high voltage is provided so that light electric light, though load current lags behind, with the correct phase operation in the control utmost point drive circuit, need accurate requirement be proposed to this circuit in the circuit resonant frequencies of the RLC that approaches to connect to converter operation.If get words significantly owing to the control electrode capacitance makes electrorheological, then situation may be more complicated.
The purpose of this invention is to provide a kind of lamp ballast, wherein, make the minimize variations that is added to the output of electric light owing to the change of linear voltage or ambient temperature.
Another object of the present invention provides a kind of lamp ballast, and it does not need to regulate DC power supply, but has the output of an adjusting.
According to the present invention, the half-bridge converter that is used for the operated discharge lamp comprises: two field effect transistor switch transistors, one output node is arranged between them, with a current transformer linear unshakable in one's determination with loading coil, the output current of this converter is by this loading coil, and at least one output winding, be used to provide control signal to arrive the switching transistor control utmost point.This converter has a feedback and regulating circuit, and it detects one of lamp operations parameter: the power that the voltage at these electric light two ends, the electric current that passes through this electric light or this electric light consume.In response to the parameter of this detection, feedback and regulating circuit make and exchange Control current and flow through control coil on the current transformer.This Control current is determined the switching time of two FET, thereby changes frequency of oscillation so that keep lamp voltage constant.
In a preferred embodiment of the invention, two oxide-semiconductor control transistors are connected in parallel on the control coil two ends, are used for conduction current in the opposite direction.Each oxide-semiconductor control transistors is controlled by separately rectification and filter circuit, and this rectification is connected so that detect the voltage that one of electric light terminal is located with the rectifier of filter circuit by it.The lamp voltage of rectification is by low pass filter filtering and be added to the control terminal of oxide-semiconductor control transistors separately.
Preferably, this transistor is MOSFET, and the transformer output winding is two control utmost point signal coils, and each coil is directly connected to the control utmost point of MOSFET separately.In normal running, in the starting that determine to trigger MOSFET constantly the time, the electric current by control coil is main factor, thus and control change device frequency.
In another embodiment, for example by using current transformer, similarly feedback has the current sensor that detects lamp current with regulating circuit.Can also use the current sensor of any other kind, such as the current sensor that detects the magnetic field that produces.In addition, by detecting lamp voltage and lamp current, and take advantage of the instantaneous value of induction, can also determine lamp power so that it becomes the parameter of feedback response.
Therefore because switching transistor is a field-effect transistor,, does not reduce load or cause the variation of the gain of feedback circuit so they do not describe the electric current of any significant control element.
Use accompanying drawing that embodiments of the invention will further be discussed.In the accompanying drawings
Fig. 1 is the schematic diagram that makes the converter that the present invention specializes, and
Fig. 2 is the schematic diagram of control utmost point drive circuit of equivalence that is used for the embodiment of Fig. 1, and
Fig. 3 is the schematic diagram that makes the converter that is used for lamp current control that the present invention specializes.
The circuit embodiments that is illustrated among Fig. 1 is for example understood basic conception of the present invention.A dc voltage power supply 2 provides dc high voltage to FET converter 3, and it can be any universal class, but normally is connected to a bridge rectifier or a voltage multiplie power supply of AC power.By the output winding T on the linear iron core of current transformer 7
1-1With T
1-2Control the switch of FET, this current transformer 7 has a loading coil T
1-3, flow to load 8 by this loading coil load current.
Resonant load circuit is connected between node S and the signal ground.The primary coil T of linear iron-core transformer 6
1-3A low-down impedance is provided in circuit, when the estimated resonant circuit working, does not need to consider it like this.Blocking capacitor C1 with big relatively electric capacity is connected between coil 7 and the resonant inductance coil L, and resonant inductance coil L connects with capacitor C2 again, and fluorescent lamp FL is connected capacitor C2 two ends.
As so far described, the circuit of Fig. 1 is identical with Fig. 3 of above-cited Nerone article.According to the present invention, feedback circuit 10 is connected the control coil T on the iron core 6 of electric light FL and transformer 7
1-4Between.Lamp voltage is added in two circuit, and all the other are identical to these two circuit except their polarity.The anode of diode D11 and D21 and negative electrode are connected to DC filter separately, and this DC filter separately is made of resistors in series R11 and R21 and the capacitor C11 and the C21 that are connected between this resistors in series and the signal ground.Resistor R 12 and R22 are connected capacitor C11 and C21 two ends, and form voltage divider with resistor R 11 and R21, and it is provided with the bias level of narrating below.
Opposite conduction type bipolarity oxide-semiconductor control transistors Q11 and Q21 are connected control coil T
1-4Two ends, and their base stage is connected to separately capacitor C11 and C21 by resistor R 13 and R23.Oxide-semiconductor control transistors and separately diode D12, D22 and resistor R 14, R24 is connected in series, diode D12, the D22 protective transistor reverse current that can not circulate, resistor R 14, R24 is a factor of definition feedback circuit gain.Another one resistor R 3 also is connected coil T
1-4Two ends are so that provide suitable buffering and biasing.
In the operation, C11, the voltage at C21 two ends are the proportional direct voltages of positive and negative half period with lamp voltage.The variation that produces in the base voltage of oxide-semiconductor control transistors plays a part to change the switch periods of switching transistor, thereby changes the self-resonant frequency of converter.
If converter frequency changes, the output voltage that then is added to electric light will change, and this knows.Correspondingly, because current feedback, the controlled change of converter frequency reduces the variation of lamp voltage, and this other variation owing to ambient temperature or line voltage distribution causes.
According to Ampere's law, by writing down the operation that mathematically to analyze this circuit, H
*Dl=N3
*i
L+ N2
*i
s+ N1
*i
s+ N4
*i
c(1)
Wherein, N is the number of turn of coil separately, i
LBe by inductance and coil T
1-3Electric current, i
sBe the electric current in the feedback coil, and i
cIt is the electric current in the control coil.Because N2 equates with N1 and can think to equal N, so following formula can be simplified.In addition, as shown in Figure 2, it is L that the magnetizing inductance of current transformer reflexes to control utmost point drive circuit
mAnd control coil also is reflected into and equals (N4/2N) i
cCurrent source i
CLTherefore i in equivalent electric circuit
z=(i
s-i
CL)-i
Mag(2)
Wherein, i
zBe Zener diode electric current (the control utmost point of the source electric capacity of MOSFET is thought zero) and i
MagReflection magnetizing current for transformer.Obtain thus, when magnetizing current surpasses feedback current i
sWith Control current i
cBetween difference the time, i
zReindexing and control pole tension change polarity, and it turn-offs this MOSFET.
Pass through relational expression
The relation of the shut-in time of converter frequency can be described,
V wherein
zBe the puncture voltage of Zener diode, L
mBe the magnetizing inductance that reflexes to the control utmost point drive circuit of Q1, φ is that the resonant circuit input current is added to the phase angle between the voltage of this resonant circuit by the half-bridge converter, and ω is a converter frequency.Hypothesis has high quality factor (Q) steady state operation, current i in resonant circuit
LBe to have peak I
pSine curve so that i
L(t)=-I
pSin (ω t) (4)
At switching time
i
s(π-φ)=i
mag((π-φ)／ω (5)
Therefore we can determine from equation (3)
sin(φ)=NπV
z／N3*I
pωL
m (6)
Equation (6) is controlled the self-oscillation operation of this circuit in company with the resonant tank parameter.I wherein
sDraw together Control current i
CLInfluence, regulate converter and change with compensation.
From top equation and analysis, this is fully aware of: control signal i
cInsertion changed converter frequency, help to keep lamp voltage constant and change with incoming line change in voltage, load resistance or other deviation irrelevant.If remove electric light FL, if do not feed back, excessive high voltage will appear at electric light terminal place.This has increased i
CLAmplitude (i consequently
s-i
CL) be approximately zero.This causes opening switch Q1 and Q2, and the overvoltage protection of embedding is provided.
Those of ordinary skills can easily derive other details of actual converter, and this is not to realize key of the present invention.For example, DC power supply 2 preferably has any full-wave rectifier design of knowing of suitable fuse and RF noise filter, and still the design of less expensive or simplification is an acceptable in some applications.This lighting circuit can be different, as long as have a node or transducer, and from then on can acquisition and lamp voltage or the proportionate signal of electric current.
Except arranging feedback circuit so that the lamp current minimize variations, the embodiment of Fig. 3 is similar to Fig. 1.Use identical reference number, wherein the element function is identical and circuit numerical value may be identical, and for the design and construction optimization, other circuit component values can be different.Therefore converter can be identical with Fig. 1 with load circuit.Feedback circuit 310 is connected the control coil T on the iron core 6 of current transformer T302 and transformer 7
1-304Between.Current transformer T302 measures actual lamp current.For example, two conductors that are connected to the filament of electric light FL1 can pass through iron core, so that core induction is the differential current of the arc current of reality.Be added to two circuit with the proportional signal of lamp current, these two circuit are identical except that their polarity.Be similar to the circuit of Fig. 1, the anode of diode D311 and D321 and negative electrode be connected to respectively by resistors in series R311 and R321 and be connected capacitor C311 between this resistors in series and the signal ground and DC filter separately that C321 forms on.Resistor R 312 and R322 are connected capacitor C311 and C321 two ends, and form voltage divider with resistor R 311 and R321, and it is provided with the bias level of narrating below.
Opposite conduction type bipolarity oxide-semiconductor control transistors Q311 and Q321 are connected control coil T
1-304Two ends, and their base stage is connected to separately capacitor C311 and C321 by resistor R 313 and R323.Oxide-semiconductor control transistors and separately diode D312, D322 and resistor R 314, R324 is connected in series, diode D312, the D322 protective transistor reverse current that can not circulate, resistor R 314, R324 is a factor of the gain of definition feedback circuit.Another one resistor R 303 also is connected coil T1-304 two ends so that suitable buffering and biasing is provided.
In the operation, C311, the voltage at C321 two ends are the proportional direct voltages of positive and negative half period with lamp current.The variation that produces in the base voltage of oxide-semiconductor control transistors plays a part to change the switch periods of switching transistor, thereby changes the self-resonant frequency of converter.Therefore owing to current feedback, the in check change of converter frequency reduces the variation of lamp current, and this is in addition owing to variation of ambient temperature or line voltage distribution causes.
In these preferred embodiments, resonant inductance coil and current transformer both unshakable in one's determination be operated in the common range of linearity of flux.The ballast embodiment of the disclosure is meant and is used for single electric light simultaneously, but the embodiment of a plurality of electric lights also is feasible, and this knows.Certainly, needs are provided suitable start-up circuit.Therefore, scope of the present invention can only be by additional claim restriction.
Claims (10)
1. self-oscillation converter that is used at least one discharge lamp (FL1), wherein converter comprises having two field-effect transistor (Q1, Q2) and the half-bridge converter (3) of the output node (S) between described field-effect transistor, one is used to control the control utmost point drive circuit of described field-effect transistor and has the loading coil (T that load current passes through
1-3) a linear iron-core transformer (7), this load coil (T
1-3) have an end that is connected to output node, it is characterized in that: transformer (7) comprises a control coil (T
1-4), this converter further comprises one the device that is used to control utmost point drive circuit, so that it is constant with the lamp working parameter in the parameter group that keeps lamp current, lamp voltage and lamp power formation to change frequency of oscillation, described device comprises and is connected to described control coil (T
1-4) and at described control coil (T
1-4) in produce the feedback and the regulating circuit (10,310) of alternating current Control current.
2. converter as claimed in claim 1, wherein converter is that the Voltage Feedback converter comprises the device that is used to detect lamp voltage with this feedback and regulating circuit (10), and this Control current is in response to the voltage that detects.
3. converter as claimed in claim 1 or 2, it is characterized in that what described transformer (7) comprised further that first control utmost point signal coil (T1-4) that the control that is connected to a described field-effect transistor (Q1) is extremely gone up and the control that is connected to the described field-effect transistor of another one (Q2) extremely go up second controls utmost point signal coil (T
1-2).
4. converter as claimed in claim 3, wherein said control utmost point signal coil (T
1-1, T
1-2) directly being connected to the control utmost point separately, (ZP1 ZP2) is connected in series in each control utmost point signal coil (T to two corresponding reversed polarity Zener diodes
1-1, T
1-2) two ends, and described control utmost point signal coil (T
1-1, T
1-2) without any the loading of additional circuit.
5. converter as claimed in claim 3 is characterized in that: described feedback and regulating circuit (10) comprise
-the first rectification and filter circuit are used to provide first unidirectional voltage with first polarity,
-the second rectification and filter circuit, provide have with the described first opposite polarity polarity second unidirectional voltage,
-in response to the first unidirectional current control circuit of described first unidirectional voltage, comprising first oxide-semiconductor control transistors (Q11) with a current path, first oxide-semiconductor control transistors (Q11) is connected control coil (T
1-4) two ends so as to allow electric current on a direction by control coil (T
1-4), and
-in response to the second unidirectional current control circuit of described second unidirectional voltage, comprising second oxide-semiconductor control transistors (21), this second oxide-semiconductor control transistors (21) is connected control coil (T
1-4) two ends so as to allow electric current in a direction opposite with this direction by control coil (T
1-4).
6. converter as claimed in claim 5, wherein said first rectification and filter circuit comprise a low pass filter, this low pass filter comprise input resistor (R11) with the parallel by-passed resistor (R12) that is connected of capacitor (C11), described input resistor (R11) and by-passed resistor (R12) form a voltage divider, it provides bias voltage for described first oxide-semiconductor control transistors (Q11), wherein said second rectification and filter circuit comprise a low pass filter, this low pass filter comprise input resistor (R21) with the parallel by-passed resistor (R22) that is connected of capacitor (C21), described input resistor (R21) and by-passed resistor (R22) form a voltage divider, it provides bias voltage for described second oxide-semiconductor control transistors (Q21), and wherein said oxide-semiconductor control transistors (Q11, Q21) be bipolarity junction transistor with other base stage of branch, and the low pass filter that is included in first rectification and the filter circuit comprises the another one resistor (R13) that is connected between voltage divider and first oxide-semiconductor control transistors (Q11), comprises another one resistor (R23) between the base stage that is connected voltage divider and second oxide-semiconductor control transistors (Q21) and be included in this low pass filter in second rectification and the filter circuit.
7. converter as claimed in claim 6, wherein said feedback and regulating circuit (10) further comprise with each oxide-semiconductor control transistors (Q11, the protection diode separately that Q21) is connected in series (D12, D22).
8. converter as claimed in claim 1, wherein feedback comprises the device that detects lamp current with regulating circuit (310), and this Control current is in response to the electric current of this detection.
9. converter as claimed in claim 8, the described device that wherein is used to detect lamp current comprises a current transformer (T302).
10. converter as claimed in claim 9, wherein, described current transformer (T302) is one and has differential current transformer unshakable in one's determination that the conductor dbus that is connected to filament for electric lamp is crossed this iron core.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09/221,953 | 1998-12-28 | ||
| US09/221,953 US6072710A (en) | 1998-12-28 | 1998-12-28 | Regulated self-oscillating resonant converter with current feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1291420A true CN1291420A (en) | 2001-04-11 |
Family
ID=22830127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99803197A Pending CN1291420A (en) | 1998-12-28 | 1999-12-15 | Ballast circuit |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6072710A (en) |
| EP (1) | EP1057383A1 (en) |
| JP (1) | JP2002534768A (en) |
| CN (1) | CN1291420A (en) |
| WO (1) | WO2000040063A1 (en) |
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| CN100397770C (en) * | 2004-05-19 | 2008-06-25 | 美国芯源系统股份有限公司 | Method and apparatus for single-ended conversion of DC to AC power for driving discharge lamps |
| CN101547545A (en) * | 2008-03-28 | 2009-09-30 | 马士科技有限公司 | Fluorescent lamp control circuit |
| CN1956616B (en) * | 2005-10-27 | 2011-08-31 | 三菱电机株式会社 | Illumining device for discharge lamp |
| CN102933009A (en) * | 2011-08-08 | 2013-02-13 | 天网电子股份有限公司 | Electronic ballast capable of self-protecting at end of life or before premature death of fluorescent lamp tube |
| CN101287319B (en) * | 2008-06-13 | 2013-03-20 | 许观泉 | Energy-saving florescent lamp |
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| US6407935B1 (en) * | 2000-05-30 | 2002-06-18 | Koninklijke Philips Electronics N.V. | High frequency electronic ballast with reactive power compensation |
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| WO2009044293A2 (en) * | 2007-06-04 | 2009-04-09 | Sustainable Energy Technologies | Prediction scheme for step wave power converter and inductive inverter topology |
| CN201536447U (en) * | 2009-03-24 | 2010-07-28 | 李声汉 | Self-oscillation electronic ballast free of transformer |
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| US8278891B2 (en) * | 2010-04-01 | 2012-10-02 | Lien Chang Electronic Enterprise Co., Ltd. | Feedback voltage stabilizing apparatus, method, and power conversion system |
| TWI450635B (en) * | 2011-09-02 | 2014-08-21 | Delta Electronics Inc | Led lighting system architecture |
| WO2015105795A1 (en) * | 2014-01-07 | 2015-07-16 | Arizona Board Of Regents On Behalf Of Arizona State University | Zero-voltage transition in power converters with an auxiliary circuit |
| CN111464063B (en) * | 2020-04-29 | 2024-05-07 | 华南理工大学 | Multi-load wireless power transmission system |
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| US5191262A (en) * | 1978-12-28 | 1993-03-02 | Nilssen Ole K | Extra cost-effective electronic ballast |
| US5177409A (en) * | 1987-01-12 | 1993-01-05 | Nilssen Ole K | Controllable electronic ballast |
| FR2627342B1 (en) * | 1988-02-16 | 1990-07-20 | Applic Util Proprietes Ele | LUMINESCENT TUBE FEEDING DEVICE |
| WO1990011672A1 (en) * | 1989-03-27 | 1990-10-04 | Toshiba Lighting & Technology Corporation | Device for lighting a discharge lamp |
| US5138236B1 (en) * | 1991-05-28 | 1996-11-26 | Motorola Lighting Inc | Circuit for driving a gas discharge lamp load |
| US5382882A (en) * | 1993-04-20 | 1995-01-17 | General Electric Company | Power supply circuit for a gas discharge lamp |
| DE4430397A1 (en) * | 1994-08-26 | 1996-02-29 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating low-pressure discharge lamps |
| TW296894U (en) * | 1995-11-21 | 1997-01-21 | Philips Electronics Nv | Circuit arrangement |
| US5619106A (en) * | 1996-06-24 | 1997-04-08 | General Electric Company | Diodeless start circiut for gas discharge lamp having a voltage divider connected across the switching element of the inverter |
| US5689155A (en) * | 1996-10-25 | 1997-11-18 | Yao Shung Electronic Co., Ltd. | Electronic stabilizer having a variable frequency soft start circuit |
-
1998
- 1998-12-28 US US09/221,953 patent/US6072710A/en not_active Expired - Fee Related
-
1999
- 1999-12-15 WO PCT/EP1999/010226 patent/WO2000040063A1/en not_active Application Discontinuation
- 1999-12-15 CN CN99803197A patent/CN1291420A/en active Pending
- 1999-12-15 JP JP2000591841A patent/JP2002534768A/en active Pending
- 1999-12-15 EP EP99965524A patent/EP1057383A1/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397770C (en) * | 2004-05-19 | 2008-06-25 | 美国芯源系统股份有限公司 | Method and apparatus for single-ended conversion of DC to AC power for driving discharge lamps |
| CN1956616B (en) * | 2005-10-27 | 2011-08-31 | 三菱电机株式会社 | Illumining device for discharge lamp |
| CN101978590B (en) * | 2008-02-02 | 2015-03-18 | 拉塞尔·雅克 | Biopolar power control |
| CN101547545A (en) * | 2008-03-28 | 2009-09-30 | 马士科技有限公司 | Fluorescent lamp control circuit |
| CN101287319B (en) * | 2008-06-13 | 2013-03-20 | 许观泉 | Energy-saving florescent lamp |
| CN102933009A (en) * | 2011-08-08 | 2013-02-13 | 天网电子股份有限公司 | Electronic ballast capable of self-protecting at end of life or before premature death of fluorescent lamp tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002534768A (en) | 2002-10-15 |
| WO2000040063A1 (en) | 2000-07-06 |
| EP1057383A1 (en) | 2000-12-06 |
| US6072710A (en) | 2000-06-06 |
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